US5906127A - Method and apparatus for forming internal spline ring - Google Patents

Method and apparatus for forming internal spline ring Download PDF

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Publication number
US5906127A
US5906127A US08/898,474 US89847497A US5906127A US 5906127 A US5906127 A US 5906127A US 89847497 A US89847497 A US 89847497A US 5906127 A US5906127 A US 5906127A
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US
United States
Prior art keywords
annular member
internal
diameter
mandrel
finished
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US08/898,474
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English (en)
Inventor
Migiei Nakamura
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Mazda Motor Corp
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Mazda Motor Corp
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Publication date
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Assigned to MAZDA MOTOR CORPORATION reassignment MAZDA MOTOR CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: NAKAMURA, MIGIEI
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/14—Spinning
    • B21D22/16—Spinning over shaping mandrels or formers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/26—Making other particular articles wheels or the like
    • B21D53/28—Making other particular articles wheels or the like gear wheels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H7/00—Making articles not provided for in the preceding groups, e.g. agricultural tools, dinner forks, knives, spoons
    • B21H7/18—Making articles not provided for in the preceding groups, e.g. agricultural tools, dinner forks, knives, spoons grooved pins; Rolling grooves, e.g. oil grooves, in articles
    • B21H7/187—Rolling helical or rectilinear grooves

Definitions

  • This invention relates to a method of and apparatus for forming an internal spline annular member such as an internal spline ring engageable with a splined shaft and an internal gear used as one of elementary gears of a planetary gear mechanism.
  • splines of an internal spline ring engageable with a splined shaft is cut by use of a spline broach. It is also typical to form an internal spline ring in a form rolling method where an annular member is pressed and deformed between an inner spline forming roller and outer backup rollers.
  • form rolling methods is known from, for example, Japanese Unexamined Patent Publication No. 62-144836.
  • Forming or cutting splines by use of a spline broach is relatively unsuitable for small-sized splines and, in addition, defective in forming splines having high strength.
  • the half-finished annular member is preferably rotated.
  • the spline forming press roller is brought into press-contact with the half-finished annular member at commencement of rotation of the half-finished annular member.
  • the spline forming press roller may press partly the half-finished annular member and be moved in an axial direction in which the mandrel is driven into the half-finished annular member together with the mandrel, or otherwise may press the half-finished annular member over the entire axial length of the half-finished annular member.
  • the half-finished annular member may be provided by reducing an annular member having an internal diameter between the internal tip diameter of the internal spline annular member by pressing radially the annular member between a cylindrical core rod having an external diameter smaller than the internal tip diameter, which is integral with the externally splined mandrel, and reducing press rollers.
  • the externally splined mandrel is press-driven axially into the annular member, the annular member is deformed to precisely profile the splines of the mandrel even when the internal spline annular member has a small module.
  • the utilization of the externally splined mandrel integrally formed with the cylindrical core rod makes it easy to form an internal spline annular member subsequently to providing a half-finished annular member directly from an annular member.
  • an annular member always remains coaxial with respect to the mandrel during the step of providing a half-finished annular member and the step of forming an internal spline annular member even though it is radially pressed, an internal spline ring is precisely formed.
  • FIG. 1 is a schematic cross-sectional view of an apparatus for forming an internal spline ring according to an embodiment of the invention
  • FIG. 2A is a cross-sectional view of an internal spline ring as a finished product
  • FIG. 2B is a rear view of the internal spline ring
  • FIGS. 3A through 3C are explanatory views showing a step of providing a half-finished annular member
  • FIG. 4 is a cross-sectional view taken along line IV--IV of FIG. 3B;
  • FIG. 5 is a cross-sectional view taken along line V--V of FIG. 3C;
  • FIGS. 6A through 6C are explanatory views showing a step of forming an internal spline annular member.
  • FIG. 7 is a cross-sectional view taken along line VII--VII of FIG. 6B.
  • the spline forming apparatus 100 has a frame 1 provided with a motor 3 secured to one of its side walls, namely the left side wall 1a as viewed in FIG. 1, and a hydraulic cylinder 5 secured to another one of the side walls, namely the right side wall 1b, as viewed in FIG. 1.
  • the frame 1 at the left side wall 1a supports a rotary disk table 2 for rotation to which a cylindrical work mount 4 is coaxially secured on which an annular work W is mounted.
  • the motor 3 is connected to the rotary disk table 2 and drives the rotary disk table 2 about a horizontal center axis of rotation L.
  • the frame 1 at the right side wall 1b supports a piston 6 of the hydraulic cylinder 5 for axial movement along the rotational center axis L.
  • the piston 6 at its rear end is provided with a mandrel 7 coaxially therewith.
  • the mandrel 7 comprises a splined plunge forming core rod 12 and a splined guide head 14 connected by means of a cylindrical core rod 13 smaller in diameter than the splined plunge forming core rod 12.
  • FIGS. 2A and 2B show, by way of example, a completed splined ring 8 having internal splines 11 which are formed by the spline forming apparatus 100 shown in FIG. 1 as an annular work W.
  • the internal spline ring 8 comprises a cup-like ring section 9 and an internal spline ring section 10 having an outer diameter smaller than the outer diameter of the cup section 9.
  • the internal spline ring section 10 has a plurality of internal splines 11 arranged at regular angles and having a root circle diameter D1 (which is also referred to as an inner diameter of the internal spline ring section 10) and a tip diameter D2.
  • the splined plunge forming core rod 12 has a plurality of external splines mating with the internal splines 11 of the internal spline ring section 10.
  • the cylindrical core rod 13 has a diameter slightly greater than the root circle diameter D1 of the internal spline ring section 10 or approximately equal to the tip diameter D2 of the internal spline ring section 10.
  • the splined guide head 14 has the same number and dimensions of external splines as the splined plunge forming core rod 12. These splined plunge forming core rod 12 and splined guide head 14 have splines in alignment with each other.
  • the work mount 4 has a shoulder by which the work mount 4 is divided into a work mount section 4a having a diameter and a height adapted to mount the cup section 9 of the splined ring member 8 thereon and an end support section 4b for supporting the splined ring member 8 thereon.
  • the work mount 4 is formed with an axial bore 4c formed with internal splines 15 so as to mate with both splined plunge forming core rod 12 and splined guide head 14.
  • the spline forming apparatus 100 is further provided with a plurality of, for example three in this embodiment, reducing press rollers 36, which are supported for rotation by pistons 31 driven by hydraulic cylinders 30, for reducing the annular work W mounted on the work mount 4 in a radial direction in a first step of the spline forming process as shown in FIGS. 3A-3C, and a plurality of, for example two in this embodiment, spline forming press rollers 46, which are supported for rotation by pistons 41 driven by hydraulic cylinders 40, for crushing the wall of the annular work W mounted on the work mount 4 in an axial direction in a second step of the spline forming process as shown in FIGS. 6A-6C.
  • the hydraulic cylinders 30 are arranged around the work mount 4 at regular angles and supported by the frame 1.
  • the cylinders 40 are arranged in diametrically opposite positions with respect to the work mount 4 and supported by the frame 1.
  • an internal spline ring 8 comprising a cup-like ring section 9 and a spline ring section 10 with a plurality of internal splines 11 arranged at regular angles and having a root circle diameter D1 and a tip diameter D2 shown in FIGS. 2A and 2B.
  • FIGS. 3A-3C show the first step of the spline forming process.
  • An annular work W is provisionally half-finished so as to comprise a cup-like ring section 19 and a ring section 20.
  • the ring section 20 has an outer diameter D4 significantly greater than the outer diameter of the internal spline ring section 10 of the internal spline ring 8 and an inner diameter D3 slightly greater than the inner diameter D1 (the root circle diameter of the splines) of the internal spline ring section 10 of the internal spline ring 8.
  • the half-finished annular work W is mounted on the work mount 4 in such a way that the cup-like ring section 19 is fit onto the mount section 4a until the rear end 19a is brought into abutment against the end support section 4b.
  • the hydraulic cylinder 5 forces the mandrel 7 into the inside of the ring section 20 of the annular work W as shown in FIG. 3A until the splined guide head 14 is entirely brought into engagement with the splined axial bore 4c of the work mount 4 as shown in FIG. 3B.
  • the ring section 20 automatically lies over the cylindrical core rod 13 of the mandrel 7 with a radial clearance.
  • the hydraulic cylinders 30 force the pistons 31 to bring the reducing press rollers 36 into firm contact with the outside of the ring section 20 of the annular work W along the entire length as shown in FIGS. 3B and 4. Subsequently, while the hydraulic cylinders 30 force the reducing press rollers 36 to continuously press the ring section 20 of the annular work W in the radial direction, the motor 3 is actuated to rotate the work mount 4.
  • the reducing press rollers 36 force down the ring section 20 of the annular work W, reducing the ring section 20 in diameter until the cylindrical core rod 13 of the mandrel 7 is contacted by an inner surface of the ring section 20 as shown in FIGS. 3C and 5.
  • the annular work W thus shaped has an inner diameter D3 approximately equal to the tip diameter D2 of the finished internal spline ring section 10.
  • the ring section 20 of the half-finished annular work W may have an inner diameter at least smaller than the root circle diameter D1 of the internal spline ring section 10 of the finished internal spline ring 8.
  • the hydraulic cylinders 5 and 40 protrude their pistons 6 and 41 in an axial direction along the horizontal center axis of rotation L of the work mount 4 to move the spline forming press rollers 46 and the mandrel 7 together, so as to crush the wall of the ring section 20 of the annular work W between the spline forming press rollers 46 and the splined plunge forming core rod 12 of the mandrel 7 as shown in FIGS. 6B and 7 until at least the spline forming press rollers 46 reach the rear end of the ring section 20 of the annular work W as shown in FIG. 6C.
  • the piston 6 is further moved in the axial direction until the leading end of the splined plunge forming core rod 12 is brought into engagement with the splined axial bore 4c of the work mount 4. In this way, the annular work W is shaped as the internal spline ring 8.
  • the spline forming press rollers 46 and the splined plunge forming core rod 12 are controlled to provide a precise distance therebetween and to move at a precisely regulated speed.
  • the spline forming apparatus 100 may be further provided with idle rollers between each adjacent press rollers 36, 46 so as to prevent the ring section 20 of the annular work W from encountering undesirable deformation during the first and/or second steps.
  • a press roller having a length sufficiently covering the whole axial length of the internal spline ring section 10 of the internal spline ring 8 may be employed. In this case, while the press roller is fixed in the axial direction, only the mandrel 7 is moved in the axial direction.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Agronomy & Crop Science (AREA)
  • Forging (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Automatic Assembly (AREA)
  • Gears, Cams (AREA)
US08/898,474 1996-07-25 1997-07-22 Method and apparatus for forming internal spline ring Expired - Lifetime US5906127A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP8-196040 1996-07-25
JP19604096A JP3567629B2 (ja) 1996-07-25 1996-07-25 内歯を有する環状体の成形方法およびその装置

Publications (1)

Publication Number Publication Date
US5906127A true US5906127A (en) 1999-05-25

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Family Applications (1)

Application Number Title Priority Date Filing Date
US08/898,474 Expired - Lifetime US5906127A (en) 1996-07-25 1997-07-22 Method and apparatus for forming internal spline ring

Country Status (3)

Country Link
US (1) US5906127A (de)
JP (1) JP3567629B2 (de)
DE (1) DE19732146B4 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6508094B1 (en) * 1999-06-30 2003-01-21 Aisin Aw Co., Ltd. Internally-toothed member, and method and apparatus for molding same
US20030200781A1 (en) * 2002-04-25 2003-10-30 Yahya Hodjat Method of tensile flow forming
US20040093922A1 (en) * 2002-11-20 2004-05-20 David Mayfield Method and apparatus for spinning to a constant length
US20050223557A1 (en) * 2004-04-09 2005-10-13 Nsk Ltd. Manufacturing method for drive wheel rolling bearing unit and manufacturing apparatus therefor
US20050257588A1 (en) * 2004-05-21 2005-11-24 Lancaster Paul B Metal spin forming head
US20080282544A1 (en) * 2007-05-11 2008-11-20 Roger Lawcock Powder metal internal gear rolling process

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006341287A (ja) * 2005-06-09 2006-12-21 Profiroll Technologies Gmbh コップ状又は環状の回転対称加工物の内面に作用するマンドレルで内部輪郭を製作する方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3181329A (en) * 1963-10-08 1965-05-04 Lodge & Shipley Co Method of forming ribbed tubes
US4313328A (en) * 1979-06-25 1982-02-02 Mannesmann Aktiengesellschaft Providing cardan and universal joint-type shafts with gearing
JPS62144836A (ja) * 1985-12-20 1987-06-29 Toyota Motor Corp 転造装置
US4854148A (en) * 1987-06-19 1989-08-08 The Babcock & Wilcox Company Cold drawing technique and apparatus for forming internally grooved tubes
US4884427A (en) * 1986-12-15 1989-12-05 Hitachi, Ltd. Method of producing helical internal gear

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD291259A5 (de) * 1990-01-02 1991-06-27 Waelzlager Normteile Veb Verfahren zur herstellung ringfoermiger teile
DE19603773A1 (de) * 1996-02-02 1996-08-08 Leifeld Gmbh & Co Verfahren zum Herstellen rotationssymmetrischer Körper mit Nabe

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3181329A (en) * 1963-10-08 1965-05-04 Lodge & Shipley Co Method of forming ribbed tubes
US4313328A (en) * 1979-06-25 1982-02-02 Mannesmann Aktiengesellschaft Providing cardan and universal joint-type shafts with gearing
JPS62144836A (ja) * 1985-12-20 1987-06-29 Toyota Motor Corp 転造装置
US4884427A (en) * 1986-12-15 1989-12-05 Hitachi, Ltd. Method of producing helical internal gear
US4854148A (en) * 1987-06-19 1989-08-08 The Babcock & Wilcox Company Cold drawing technique and apparatus for forming internally grooved tubes

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6508094B1 (en) * 1999-06-30 2003-01-21 Aisin Aw Co., Ltd. Internally-toothed member, and method and apparatus for molding same
US20030200781A1 (en) * 2002-04-25 2003-10-30 Yahya Hodjat Method of tensile flow forming
US20040093922A1 (en) * 2002-11-20 2004-05-20 David Mayfield Method and apparatus for spinning to a constant length
US6983632B2 (en) * 2002-11-20 2006-01-10 Hess Engineering, Inc. Method and apparatus for spinning to a constant length
US20050223557A1 (en) * 2004-04-09 2005-10-13 Nsk Ltd. Manufacturing method for drive wheel rolling bearing unit and manufacturing apparatus therefor
US7707724B2 (en) * 2004-04-09 2010-05-04 Nsk Ltd. Manufacturing method for a drive wheel rolling bearing unit and manufacturing apparatus therefor
US20050257588A1 (en) * 2004-05-21 2005-11-24 Lancaster Paul B Metal spin forming head
US7316142B2 (en) * 2004-05-21 2008-01-08 Lancaster Paul B Metal spin forming head
US20080282544A1 (en) * 2007-05-11 2008-11-20 Roger Lawcock Powder metal internal gear rolling process

Also Published As

Publication number Publication date
DE19732146B4 (de) 2007-04-19
JPH1034271A (ja) 1998-02-10
DE19732146A1 (de) 1998-01-29
JP3567629B2 (ja) 2004-09-22

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